I used to have a lot of those. I got them from a gift shop. The pack they came in was called "Pirate treasure" or something of that nature. I remember when I got bored with them, I threw them around, thinking it would be funny to trick people. Now that I metal detect, I no longer think it's a funny joke lol.
...I got stone cold sober faced and told him, "don't you &*#$ with were I detect, I'll smack the *&%^ out of you. Detecting is one of my few joys .